.header{
    width: 100%;
    a{
        color: white;
    }
    .topbar{
        background: black;
       .layout{
           width: 1000px;
           height: 30px;
           margin:  0 auto;
           .topbar_left{
               float: left;
               line-height: 30px;
               ul{
                   li{
                       color: white;
                       float: left;
                   }
               }
           }
           .topbar_right{
               float: right;
               line-height: 30px;
               li{
                    color: white;
                    float: left;
                    margin-left: 10px;
                    cursor: pointer;
                }
           }
        } 
    }
   
}
